FreeBSD/Linux Kernel Cross Reference
sys/sparc64/include/bus_private.h

     /*-
      * Copyright (c) 1997, 1998 Justin T. Gibbs.
      * Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *      from: FreeBSD: src/sys/i386/i386/busdma_machdep.c,v 1.25 2002/01/05
     *
     * $FreeBSD: releng/6.0/sys/sparc64/include/bus_private.h 131224 2004-06-28 04:04:43Z scottl $
     */
    
    #ifndef _MACHINE_BUS_PRIVATE_H_
    #define _MACHINE_BUS_PRIVATE_H_
    
    #include <sys/queue.h>
    
    /*
     * Helpers
     */
    int sparc64_bus_mem_map(bus_space_tag_t, bus_space_handle_t, bus_size_t,
        int, vm_offset_t, void **);
    int sparc64_bus_mem_unmap(void *, bus_size_t);
    bus_space_handle_t sparc64_fake_bustag(int, bus_addr_t, struct bus_space_tag *);
    
    struct bus_dmamap_res {
            struct resource         *dr_res;
            bus_size_t              dr_used;
            SLIST_ENTRY(bus_dmamap_res)     dr_link;
    };
    
    /*
     * Callers of the bus_dma interfaces must always protect their tags and maps
     * appropriately against concurrent access. However, when a map is on a LRU
     * queue, there is a second access path to it; for this case, the locking rules
     * are given in the parenthesized comments below:
     *      q - locked by the mutex protecting the queue.
     *      p - private to the owner of the map, no access through the queue.
     *      * - comment refers to pointer target.
     * Only the owner of the map is allowed to insert the map into a queue. Removal
     * and repositioning (i.e. temporal removal and reinsertion) is allowed to all
     * if the queue lock is held.
     */
    struct bus_dmamap {
            TAILQ_ENTRY(bus_dmamap) dm_maplruq;             /* (q) */
            SLIST_HEAD(, bus_dmamap_res)    dm_reslist;     /* (q, *q) */
            int                     dm_onq;                 /* (q) */
            int                     dm_flags;               /* (p) */
    };
    
    /* Flag values. */
    #define DMF_LOADED      1       /* Map is loaded */
    #define DMF_COHERENT    2       /* Coherent mapping requested */
    
    int sparc64_dma_alloc_map(bus_dma_tag_t dmat, bus_dmamap_t *mapp);
    void sparc64_dma_free_map(bus_dma_tag_t dmat, bus_dmamap_t map);
    
    /*
     * XXX: This is a kluge. It would be better to handle dma tags in a hierarchical
     * way, and have a BUS_GET_DMA_TAG(); however, since this is not currently the
     * case, save a root tag in the relevant bus attach function and use that.
     */
    extern bus_dma_tag_t sparc64_root_dma_tag;
    
    #endif /* !_MACHINE_BUS_PRIVATE_H_ */

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